Back to EveryPatent.com
United States Patent | 5,687,092 |
Bretmersky ,   et al. | November 11, 1997 |
A fluid dispensing control for controlling the dispensing of a fluid by a metering valve through a nozzle onto a workpiece. An initial value of a flow characteristic of the fluid is determined that is correlated to the relationship between the flow rate of the fluid and nozzle pressure. Desired nozzle pressure values are periodically determined by evaluating a model of flow rate of the fluid through nozzle in response to the initial value of the flow characteristic and a desired flow rate value. Thereafter, the control provides command signals to the metering valve as a function of the desired nozzle pressures. A new value of the flow characteristic is determined as a function of the measured volume of fluid dispensed during the dispensing cycle to the measured nozzle pressure. During a subsequent dispensing cycle, the control determines the desired nozzle pressures by evaluating the model of flow rate of the fluid through the nozzle as a function of the new value of the flow characteristic. The process of reevaluating the flow characteristic over successive dispensing cycles as a function of measured volumes of fluid dispensed and measured nozzle pressures, and using those updated values to reevaluate the model of flow rate of fluid through the nozzle, is repeated.
Inventors: | Bretmersky; Carl A. (North Olmsted, OH); Hall; Robert C. (Strongsville, OH); Klein; Richard G. (Avon Lake, OH) |
Assignee: | Nordson Corporation (Westlake, OH) |
Appl. No.: | 435972 |
Filed: | May 5, 1995 |
Current U.S. Class: | 702/100; 118/683; 222/1; 222/55; 239/68; 700/282 |
Intern'l Class: | B67D 005/08; G01F 001/38 |
Field of Search: | 364/507,509,510,500 222/1,55,52 118/688,683,692 239/68,67,553.1 |
Re35010 | Aug., 1995 | Price | 222/1. |
1647273 | Nov., 1927 | Clayton-Kennedy. | |
1881826 | Oct., 1932 | McQuade. | |
3862414 | Jan., 1975 | Algeri. | |
3901266 | Aug., 1975 | Guy. | |
3924840 | Dec., 1975 | Nelson, Jr. | |
4013037 | Mar., 1977 | Warinin, Sr. et al. | |
4060649 | Nov., 1977 | Coleman. | |
4075976 | Feb., 1978 | Clayton. | |
4122036 | Oct., 1978 | Lewis. | |
4166246 | Aug., 1979 | Matt. | |
4183726 | Jan., 1980 | Seebald. | |
4249478 | Feb., 1981 | Gruener. | |
4315317 | Feb., 1982 | Orchard et al. | |
4357900 | Nov., 1982 | Buschor. | |
4358947 | Nov., 1982 | Greene et al. | |
4361333 | Nov., 1982 | Firth. | |
4367075 | Jan., 1983 | Hartwig. | |
4374704 | Feb., 1983 | Young. | |
4380967 | Apr., 1983 | Matt | 118/669. |
4385611 | May., 1983 | Harper et al. | |
4431690 | Feb., 1984 | Matt et al. | 427/424. |
4433237 | Feb., 1984 | Matt | 250/222. |
4493286 | Jan., 1985 | Carson | 118/677. |
4500937 | Feb., 1985 | Matt | 361/153. |
4557787 | Dec., 1985 | Mansfield et al. | 156/356. |
4561380 | Dec., 1985 | Mulder et al. | 118/688. |
4613059 | Sep., 1986 | Merkel | 222/52. |
4636401 | Jan., 1987 | Yamazaki et al. | 427/39. |
4645133 | Feb., 1987 | Hagiwara et al. | |
4720801 | Jan., 1988 | Boll | 364/510. |
4797301 | Jan., 1989 | Ardley et al. | 427/8. |
4822647 | Apr., 1989 | Nozaki et al. | 427/421. |
4828218 | May., 1989 | Medlock | 251/26. |
4829793 | May., 1989 | Holder et al. | 68/205. |
4842162 | Jun., 1989 | Merkel | 222/1. |
4872954 | Oct., 1989 | Hogan | 202/105. |
4879662 | Nov., 1989 | Vicari | 364/510. |
4922852 | May., 1990 | Price | 118/683. |
4988015 | Jan., 1991 | Price | 222/1. |
5054650 | Oct., 1991 | Price | 222/1. |
5065695 | Nov., 1991 | Baron et al. | |
5182704 | Jan., 1993 | Bengtsson | 346/148. |
5263608 | Nov., 1993 | Kiernan et al. | 222/1. |
5319568 | Jun., 1994 | Bezaire | 364/479. |
Foreign Patent Documents | |||
162770 | Dec., 1986 | GB. |
Motorbooks INternational publication entitled "Automotive Fuel Injection Systems, A Technical Guide" by Jan P. Norbye, 1988. |